CN112534687A

CN112534687A - Stator and motor

Info

Publication number: CN112534687A
Application number: CN201980051814.9A
Authority: CN
Inventors: 下平慎志; 右田贵之; 青野真乡; 川岛彰太
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2018-08-03
Filing date: 2019-07-08
Publication date: 2021-03-19
Also published as: WO2020026711A1; US20210320548A1; JPWO2020026711A1

Abstract

In one aspect of the stator of the present invention, the bus bar holder includes a base portion, an annular inside wall portion protruding from a radially inner edge portion of the base portion, an annular outside wall portion protruding from a radially outer edge portion of the base portion, and a plurality of side wall portions connecting the inside wall portion and the outside wall portion. The base portion, the inner wall portion, the outer wall portion, and the side wall portion form a plurality of recesses in the circumferential direction. The coil connecting portions of the plurality of bus bars project from the base portion toward one axial side. A pair of coil lead-out portions are respectively led out from the plurality of coils. At least a part of the coil lead-out portions is a first coil lead-out portion having a tip end portion bent to the other side in the radial direction and housed in the recess. The at least one coil connecting portion is located inside the recess, and receives a tip end portion of the at least one first coil lead-out portion inside the recess. The front end of the first coil lead-out portion is connected to the coil connecting portion in the recess.

Description

Stator and motor

Technical Field

The invention relates to a stator and a motor. The application is based on Japanese patent application No. 2018-146790, which is proposed by 8.8.3.2018. This application is for the benefit of claiming priority thereto. The contents of which are incorporated by reference in their entirety in this application.

Background

In a stator provided in an electric motor, a cross wire connecting two coils to each other and a lead wire extending from the coils are wound in a circumferential direction. In such a configuration, in order to prevent short-circuiting of the cross wires and the lead wires, etc., it is necessary to insulate the cross wires and the lead wires. For example, patent document 1 describes a structure in which an insulating tube is covered on a lead wire to insulate the lead wire.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2009-303286

Disclosure of Invention

Problems to be solved by the invention

However, in the above-described configuration, the cross wires and the lead wires need to be covered with the insulating tubes, and the number of steps and time required for the operation of insulating the cross wires and the lead wires are increased. Further, the operation of winding the cross wires and the lead wires in the circumferential direction is difficult to automate, for example, by a manual operation. Therefore, the time required for the operation of winding the cross wires and the lead wires in the circumferential direction also increases. As described above, in the above-described structure, the number of steps and time required for assembling the stator are increased, and it may be difficult to improve the productivity of the stator.

In view of the above circumstances, an object of the present invention is to provide a stator having a structure capable of improving productivity, and a motor including the stator.

Means for solving the problems

One aspect of the stator of the present invention is a stator of a motor including a shaft that rotates about a central axis, the stator including a stator core having a core back portion extending in a circumferential direction and a plurality of T-shaped brackets extending in a radial direction from the core back portion, a plurality of coils each including a conductive member and attached to the plurality of T-shaped brackets, a bus bar holder that is annular in the circumferential direction and is positioned on one axial side of the stator core, and a plurality of bus bars that are held by the bus bar holder and are electrically connected to the coils. The bus bar holder includes an annular base portion extending in a circumferential direction, an annular inner wall portion projecting from a radially inner edge portion of the base portion to one axial side, an annular outer wall portion projecting from a radially outer edge portion of the base portion to one axial side, and a plurality of side wall portions projecting from the base portion to one axial side and extending in a radial direction to connect the inner wall portion and the outer wall portion. The plurality of side wall portions are arranged at intervals in the circumferential direction. The base portion, the inner wall portion, and the outer wall portion form a plurality of recesses in the circumferential direction, the recesses being recessed toward the other axial side. The plurality of bus bars have a plurality of coil connection portions connected to the coils. The plurality of coil connecting portions are arranged at intervals in a circumferential direction, protrude from the base portion to one side in an axial direction, and are positioned inside the recess. A pair of coil lead-out portions, which are both end portions of the conductive member, are respectively led out from the plurality of coils to one axial side through one radial side of the bus bar holder. At least a part of the coil lead-out portions of the plurality of coils is a first coil lead-out portion having a tip end portion bent to the other side in the radial direction and housed in the recess. At least one of the coil connecting portions is positioned inside the recess, and receives a tip end portion of at least one of the coil drawing portions. The leading end of the first coil lead-out portion is connected to the coil connecting portion in the recess.

One aspect of the motor of the present invention includes the stator, and a rotor radially opposed to the stator with a gap therebetween.

Effects of the invention

According to one aspect of the present invention, the productivity of the stator can be improved.

Drawings

Fig. 1 is a cross-sectional view schematically showing a motor according to the present embodiment.

Fig. 2 is a perspective view showing a stator according to the present embodiment.

Fig. 3 is a sectional view showing the stator of the present embodiment, and is a sectional view III-III in fig. 2.

Fig. 4 is a perspective view showing a part of the stator of the present embodiment.

Fig. 5 is a sectional view showing a part of the stator of the present embodiment, and is a V-V sectional view in fig. 2.

Fig. 6 is a perspective view showing a part of the stator of the present embodiment.

Fig. 7 is a view of the bus bar holder of the present embodiment as viewed from above.

Fig. 8 is a perspective view showing a bus bar according to the present embodiment.

Fig. 9 is a perspective view showing a part of a stator as another example of the present embodiment.

Detailed Description

The Z-axis direction appropriately shown in the drawings is a vertical direction in which the positive side is an upper side and the negative side is a lower side. The central axis J shown in the drawings is a direction parallel to the Z axis and is an imaginary line extending in the vertical direction. In the following description, the axial direction of the central axis J, i.e., the direction parallel to the vertical direction, is simply referred to as the "axial direction", the radial direction about the central axis J is simply referred to as the "radial direction", and the circumferential direction about the central axis J is simply referred to as the "circumferential direction". In the present embodiment, the upper side corresponds to one axial side, and the lower side corresponds to the other axial side. In the present embodiment, the radially outer side corresponds to one side in the radial direction, and the radially inner side corresponds to the other side in the radial direction. The vertical direction, the upper side, and the lower side are only names for describing the relative positional relationship of the respective parts, and the actual arrangement relationship may be an arrangement relationship other than the arrangement relationship indicated by these names.

As shown in fig. 1, a motor 1 of the present embodiment includes a housing 2, a rotor 3, a stator 10, a bearing holder 4,

bearings

5a and 5b, and a control device 6. The housing 2 houses the rotor 3, the stator 10, the bearing holder 4, the

bearings

5a and 5b, and the control device 6. A bearing 5a is held at the bottom of the housing 2.

The rotor 3 is radially opposed to the stator 10 with a gap therebetween. The rotor 3 has a shaft 3a and a rotor body 3 b. Specifically, the motor 1 includes a shaft 3a and a rotor body 3 b. The shaft 3a rotates about the central axis J. The shaft 3a is cylindrical and extends in the axial direction with the center axis J as the center. The shaft 3a is rotatably supported by

bearings

5a, 5 b. The

bearings

5a and 5b are, for example, ball bearings. The rotor body 3b is fixed to the outer peripheral surface of the shaft 3 a. The rotor body 3b includes a rotor core and a magnet fixed to the rotor core, which are not shown in the drawings.

The bearing support 4 is located on the upper side of the stator 10. The bearing holder 4 holds the bearing 5 b. The bearing holder 4 has a holder through-hole 4a that penetrates the bearing holder 4 in the axial direction. The second

coil lead wires

41U, 41V, and 41W described later pass through the holder through-hole 4 a. The control device 6 is located on the upper side of the bearing bracket 4. The controller 6 includes a power supply for supplying electric power to the stator 10, which is not shown.

The stator 10 is radially opposed to the rotor 3 with a gap therebetween. In the present embodiment, the stator 10 is located radially outside the rotor 3. The stator 10 is fixed to a radially outer side of the rotor 3. The stator 10 is fixed to the inner circumferential surface of the housing 2. As shown in fig. 2 and 3, the stator 10 includes a stator core 20, a core cover 23, an insulator 30, a bus bar assembly 50, and a plurality of coils 40.

As shown in fig. 3, the stator core 20 includes a core back 21 extending in the circumferential direction, and a plurality of T-shaped brackets 22 extending radially from the core back 21. The core back 21 is annular in the circumferential direction. In the present embodiment, the core back portion 21 has an annular shape with the center axis J as the center. In the present embodiment, the plurality of T-shaped brackets 22 extend radially inward from the core back portion 21. The plurality of T-shaped holders 22 are arranged at equal intervals around the entire circumference in the circumferential direction. For example, 15T-racks 22 are provided.

In the present specification, the "annular shape in the circumferential direction" may be a shape that surrounds the central axis J continuously around the entire circumference when viewed in the axial direction. That is, in the present specification, in the case where "a certain object is annular in the circumferential direction", the shape of the certain object may be a circular shape surrounding the central axis J, an elliptical shape surrounding the central axis J, or a polygonal shape surrounding the central axis J.

In the present embodiment, the stator core 20 is configured by connecting a plurality of stator core units 20a in the circumferential direction. Each of the plurality of stator core segments 20a includes a core back segment 21a constituting a part of the core back 21 in the circumferential direction, and a T-shaped frame 22 extending radially inward from the core back segment 21 a. Both ends in the circumferential direction of the core rear single piece 21a are connected to ends in the circumferential direction of the core rear single pieces 21a adjacent in the circumferential direction in contact with each other.

The core cover 23 is positioned radially outside the stator core 20, and is cylindrical so as to surround the stator core 20. In the present embodiment, the core rear cover 23 is cylindrical and opens to both axial sides with the center axis J as the center. The core cover 23 is fitted into the stator core 20 and fixed. The core cover 23 can suppress separation of the plurality of stator core components 20a coupled to each other.

The insulator 30 is mounted to the T-shaped frame 22. In the present embodiment, an insulator 30 is provided on each T-shaped frame 22. Thus, in the present embodiment, the plurality of insulators 30 are arranged at equal intervals over the entire circumference in the circumferential direction. The insulators 30 are provided in 15 numbers, for example. The insulator 30 is made of, for example, resin. As shown in fig. 1, the insulator 30 includes an insulator main body 31, a pair of

insulator walls

32 and 33, and a pair of

insulator walls

34 and 35. The insulator main body 31 is cylindrical extending in the radial direction. Although not shown, in the present embodiment, the insulator main body 31 has a rectangular tubular shape that opens to both sides in the radial direction. The insulator body 31 is passed through the T-shaped frame 22.

The pair of

insulator walls

32, 33 protrude upward from the end portions on both sides in the radial direction of the insulator main body 31. The insulator wall 32 protrudes upward from the radially inner end of the insulator main body 31. The insulator wall 33 protrudes upward from the radially outer end of the insulator main body 31. As shown in fig. 4, the

insulator wall portions

32 and 33 are arc-shaped curved in the circumferential direction when viewed in the axial direction. The insulator wall 33 has a radial dimension larger than that of the insulator wall 32. The upper end of the insulator wall 32 and the upper end of the insulator wall 33 are located at the same position in the axial direction. The insulator wall portions 32 of the insulators 30 adjacent in the circumferential direction are connected to each other to constitute a cylindrical wall portion having the central axis J as the center.

The insulator wall 33 located radially outward of the pair of

insulator walls

32 and 33 has a through portion 33a that penetrates the insulator wall 33 in the radial direction. The through portion 33a is recessed downward from the upper end of the insulator wall 33. The through portion 33a opens upward. In the present embodiment, two penetrating portions 33a are provided for each of the insulator wall portions 33. That is, in the stator 10, for example, a total of 30 penetrating portions 33a are provided. In each insulator 30, two through portions 33a are arranged with a gap therebetween in the circumferential direction.

As shown in fig. 1, a pair of

insulator wall portions

34, 35 protrude downward from end portions on both sides in the radial direction of the insulator main body 31. The insulator wall 34 protrudes downward from the radially inner end of the insulator body 31. The insulator wall 35 protrudes downward from the radially outer end of the insulator 31. The shape of the insulator wall 34 is the same as that of the insulator wall 32, except for the symmetry in the axial direction. The shape of the insulator wall 35 is the same as that of the insulator wall 33 except for the symmetry in the axial direction. As shown in fig. 4, the insulator wall 35 has a through portion 35a that penetrates the insulator wall 35 in the radial direction.

As shown in fig. 2, the bus bar assembly 50 is located on the upper side of the stator core 20 and the insulator 30. The busbar assembly 50 includes a busbar holder 60, a plurality of busbars 70, and a plurality of resin portions 80. That is, the stator 10 includes the bus bar holder 60, the plurality of bus bars 70, and the plurality of resin portions 80. The bus bar holder 60 is located on the upper side of the stator core 20 and the insulator 30. The busbar holder 60 is annular in the circumferential direction. In the present embodiment, the bus bar holder 60 has an annular shape with the center axis J as the center. The bus bar holder 60 is made of, for example, resin. The busbar holder 60 is manufactured by insert molding using a plurality of busbars 70 as insert members, for example.

The busbar holder 60 includes a base portion 61, an inner wall portion 62, an outer wall portion 63, a plurality of

side wall portions

65a and 65b, and an annular plate portion 64. The base portion 61 is annular in the circumferential direction. In the present embodiment, the base portion 61 is annular with the central axis J as the center. As shown in fig. 5, the base 61 is located on the upper side of the coil 40. The radially inner surface of the base portion 61 is located radially outward of the radially outer surface of the insulator wall portion 32. The radially outer surface of the base portion 61 is located at the same position as the radially outer surface of the insulator wall portion 33 in the radial direction. The radially outer edge portion of the lower surface of the base portion 61 contacts the upper end portion of the insulator wall portion 33. The base portion 61 is supported from the lower side by the insulator wall portion 33.

The inner wall portion 62 protrudes upward from a radially inner edge portion of the base portion 61. As shown in fig. 2, the inner wall portion 62 is annular in the circumferential direction. In the present embodiment, the inner wall portion 62 has an annular shape with the central axis J as the center. The radially inner surface of the inner side wall portion 62 is located at the same position in the radial direction as the radially inner surface of the base portion 61. The radially inner side surface of the inner side wall portion 62 and the radially inner side surface of the base portion 61 are axially connected to each other.

The outer side wall portion 63 protrudes upward from the radially outer edge portion of the base portion 61. The outer side wall portion 63 is annular in the circumferential direction. In the present embodiment, the outer wall portion 63 has an annular shape with the center axis J as the center. The radially outer surface of the outer side wall portion 63 is located at the same position in the radial direction as the radially outer surface of the base portion 61. The radially outer side surface of the outer side wall portion 63 and the radially outer side surface of the base portion 61 are axially connected to each other. The outer side wall portion 63 has a radial dimension larger than that of the inner side wall portion 62. The upper end of the inner wall portion 62 and the upper end of the outer wall portion 63 are located at the same position in the axial direction.

The plurality of

side wall portions

65a, 65b protrude upward from the base portion 61. The plurality of

side wall portions

65a, 65b extend in the radial direction and connect the inner side wall portion 62 and the outer side wall portion 63. The plurality of

side wall portions

65a, 65b are arranged at intervals in the circumferential direction. In the present embodiment, a plurality of

side wall portions

65a and 65b are provided. For example, in the present embodiment, 24 side wall portions 65a are provided, and 3 side wall portions 65b are provided.

The plurality of side wall portions 65a are arranged continuously at equal intervals in the circumferential direction. The plurality of side wall portions 65b are adjacent to the side wall portions 65a arranged in series in the circumferential direction, and are arranged in series at equal intervals in the circumferential direction. The plurality of side wall portions 65b are located between the side wall portions 65a in the circumferential direction. In the present embodiment, the distance between the side wall portions 65a adjacent in the circumferential direction, the distance between the side wall portions 65b adjacent in the circumferential direction, and the distance between the

side wall portions

65a and 65b adjacent in the circumferential direction are the same as each other.

The circumferential dimension of the side wall portion 65a is uniform over the entire radial direction. The circumferential dimension of the side wall portion 65b increases from the radially inner side to the radially outer side. The circumferential dimension of the side wall portion 65b is larger than the circumferential dimension of the side wall portion 65 a. In the following description, the

side wall portions

65a and 65b are simply referred to as the side wall portions 65 unless otherwise specified.

The base portion 61, the inner wall portion 62, the outer wall portion 63, and the side wall portion 65 form a plurality of recesses 60a recessed downward in the circumferential direction. More specifically, each of the recesses 60a is composed of a base portion 61, an inner wall portion 62, an outer wall portion 63, and a pair of circumferentially adjacent side wall portions 65. In the present embodiment, the number of the concave portions 60a is 27, for example. The plurality of recesses 60a are arranged at equal intervals in the circumferential direction, except for two recesses 60a located between the side wall portions 65b in the circumferential direction. The plurality of recesses 60a have the same shape. The recess 60a has a substantially trapezoidal shape as viewed in the axial direction. The circumferential dimension of the recess 60a increases from the radially inner side to the radially outer side.

The lower surface of the inner surfaces of the recess 60a is an upward surface, and is an upper surface of the base 61. The radially inner surface of the recess 60a is a radially outward surface, and is a radially outer surface of the inner wall portion 62. The radially outer surface of the inner surface of the recess 60a is a radially inward surface, and is a radially inner surface of the outer wall portion 63. The circumferential surface of the inner surface of the recess 60a is the circumferential surface of the sidewall 65 located on one circumferential side of the recess 60 a. The other circumferential surface of the inner surface of the recess 60a is a circumferential surface of the sidewall 65 located on the other circumferential surface of the recess 60 a.

The annular plate portion 64 protrudes radially inward from the lower end of the base portion 61. The annular plate portion 64 is an annular plate having a plate surface facing in the axial direction with the center axis J as the center. As shown in fig. 5, the annular plate portion 64 contacts the upper end of the insulator wall 32. The annular plate portion 64 is supported from below by the insulator wall portion 32. In the present embodiment, the pair of

insulator walls

32, 33 support the bus bar holder 60 from below by supporting the annular plate portion 64 with the insulator wall 32 and supporting the base portion 61 with the insulator wall 33.

As shown in fig. 6, the busbar holder 60 includes a first groove 66a and a second groove 66 b. The first groove 66a is provided on the radially outer surface of the busbar holder 60. The first groove portion 66a is recessed radially inward. The first groove portion 66a extends in the axial direction from an end portion on the lower side of the base portion 61 to an end portion on the upper side of the outer side wall portion 63. The first groove portion 66a opens to both axial sides. In the present embodiment, the first groove portion 66a extends linearly in the axial direction. The first groove portions 66a are provided in plurality in the circumferential direction. The plurality of first groove portions 66a are arranged at equal intervals around the circumference in the circumferential direction. The number of the first grooves 66a is the same as the total number of the through portions 33a, and is, for example, 30. The circumferential positions of the first grooves 66a are the same as the circumferential positions of the through holes 33a, respectively. Each first groove 66a is located above each through hole 33 a. The lower end of the first groove 66a is connected to the upper end of the through portion 33 a. Thus, the inside of the first groove 66a is connected to the inside of the through portion 33 a.

As shown in fig. 2, in the present embodiment, one first groove portion 66a is located radially outward of each recess 60 a. Further, the first groove portions 66a are located radially outward of the side wall portions 65b, respectively. That is, the plurality of first groove portions 66a include a plurality of first groove portions 66a located radially outward of the recessed portion 60a and a plurality of first groove portions 66a located radially outward of the side wall portion 65 b. The center of the first groove portion 66a located radially outward of the recessed portion 60a in the circumferential direction is located at the same position as the center of the recessed portion 60a in the circumferential direction. The circumferential centers of the plurality of first groove portions 66a located radially outward of the side wall portion 65b are located at the same positions in the circumferential direction as the circumferential centers of the side wall portion 65 b.

The second groove portion 66b is provided at an upper end of the outer wall portion 63. That is, the second groove portion 66b is provided at an upper end portion of the radially outer wall portion of the inner wall portion 62 and the outer wall portion 63. The second groove portion 66b is recessed downward. The second groove portion 66b penetrates the outer wall portion 63 in the radial direction and opens to both sides in the radial direction. The radially outer end of the second groove 66b is connected to the upper end of the first groove 66 a. Thereby, the inside of the first groove 66a is connected to the inside of the second groove 66 b.

The second groove portions 66b are provided in plurality in the circumferential direction. The second groove portions 66b are provided radially outward of the concave portions 60a, respectively. That is, 27 second groove portions 66b are provided, for example. The radially inner end of each second groove 66b is connected to each recess 60 a. The second groove 66b is provided in each of the first grooves 66a except for 3 first grooves 66a through which the second

coil lead wires

41U, 41V, and 41W pass, which will be described later.

As shown in fig. 7, the plurality of bus bars 70 are held by the bus bar holder 60. In the present embodiment, a part of the bus bar 70 is embedded in the bus bar holder 60 and held. The plurality of bus bars 70 include phase bus bars 70U, 70V, 70W and a neutral point bus bar 70N as bus bars 70. In the present embodiment, 3

phase buses

70U, 70V, and 70W are provided. The number of the neutral point bus bars 70N is 1.

The 3 phase bus bars 70U are arranged at intervals in the circumferential direction. The phase bus bar 70U has a circumferential extension 71U,

radial extensions

72U, 73U, and a coil connecting portion 74U. The 3 bus bars 70V for phase are arranged at intervals in the circumferential direction. The phase bus bar 70V has a circumferential extension 71V,

radial extensions

72V, 73V, and a coil connecting portion 74V. The 3 phase bus bars 70W are arranged at intervals in the circumferential direction. The phase bus bar 70W has a circumferential extension 71W,

radial extensions

72W, 73W, and a coil connection portion 74W. The neutral point bus bar 70N is located between the adjacent phase bus bars 70U in the circumferential direction. The neutral point bus bar 70N has a circumferential extension 71N, a radial extension 72N, and a coil connecting portion 74N. In this manner, the plurality of bus bars 70 include a plurality of

coil connecting portions

74U, 74V, 74W, and 74N. In the following description, the

coil connections

74U, 74V, 74W, and 74N will be simply referred to as the coil connections 74 unless otherwise specified.

The

circumferentially extending portions

71U, 71V, 71W, 71N are plate-shaped with plate surfaces facing in the axial direction, and are arc-shaped extending in the circumferential direction. As shown in fig. 5 and 7, the circumferential extending

portions

71U, 71V, 71W, 71N are embedded in the base portion 61. As shown in fig. 7 and 8, the circumferential extension 71V is located radially outward of the circumferential extension 71U. The circumferential direction extending portion 71W is located radially between the circumferential direction extending portion 71U and the circumferential direction extending portion 71V. The circumferential direction extending portion 71W is located radially closer to the circumferential direction extending portion 71U than the circumferential direction extending portion 71V. That is, the radial distance between the circumferential direction extending portion 71W and the circumferential direction extending portion 71U is smaller than the radial distance between the circumferential direction extending portion 71W and the circumferential direction extending portion 71V. As shown in fig. 5, the circumferential direction extending portion 71U and the circumferential direction extending portion 71V are located at the same position in the axial direction as each other. The circumferentially extending portion 71W is located below the circumferentially extending portion 71U and the circumferentially extending portion 71V. As shown in fig. 8, the circumferential direction extending portion 71N is located at the same position as the circumferential direction extending portion 71U in the radial direction as well as in the axial direction.

As shown in fig. 7 and 8, the

radially extending portions

72U and 73U extend radially outward from the circumferential ends of the circumferentially extending portion 71U. Some of the

radially extending portions

72U, 73U span the upper side of the circumferentially extending portion 71W in the radial direction, 72U, 73U. The

radially extending portions

72V, 73V extend radially inward from the circumferential ends of the circumferentially extending portion 71V. The

radially extending portions

72W, 73W extend outward from the end portions on both sides in the circumferential direction of the circumferentially extending portion 71W. The radially extending portions 72N extend radially outward from the circumferential ends of the circumferentially extending portions 71N and the circumferential center of the circumferentially extending portions 71N. That is, 3 radial extensions 72N are provided on the neutral point bus bar 70N. Two of the radially extending portions 72N span the upper side of the circumferentially extending portion 71W in the radial direction. The radially front end portions of the respective radially extending portions are located at the same position in the radial direction. Each of the radially extending portions is plate-shaped with its plate surface facing in the axial direction.

The coil connecting portions 74U project upward from the radially outer end portions of the

radially extending portions

72U, 73U, respectively. The coil connecting portions 74V protrude upward from radially inner end portions of the

radially extending portions

72V and 73V, respectively. The coil connecting portions 74W project upward from radially outer end portions of the

radially extending portions

72W, 73W, respectively. That is, two coil connection portions 74 are provided on each of the phase bus bars 70U, 70V, and 70W. The coil connecting portions 74N protrude upward from the radially outer end portions of the 3 radially extending portions 72N, respectively. That is, 3 coil connecting portions 74N are provided on neutral point bus bar 70N.

As shown in fig. 5 and 6, the plurality of coil connection portions 74 protrude upward from the base portion 61 and are located inside the recess 60 a. At least one coil connecting portion 74 is located inside the concave portion 60a, respectively. In the present embodiment, each coil connecting portion 74 is located inside the concave portion 60 a. The coil connecting portion 74 protrudes upward from the lower side of the inner side surface of the recess 60 a. The lower end of the coil connecting portion 74 is buried in the base portion 61. The upper end of the coil connecting portion 74 is located below the lower surface of the inner surfaces of the second groove portions 66 b. The lower surface of the inner surface of the second groove 66b is an upward surface, and is a groove bottom surface of the second groove 66 b.

In the present embodiment, the coil connecting portion 74 has a plate shape with a plate surface facing in the radial direction. The coil connecting portion 74 has a gripping recess 74a recessed downward from an upper end of the coil connecting portion 74. The grip recess 74a penetrates the coil connecting portion 74 in the radial direction. The upper end of the coil connecting portion 74 is bifurcated by providing the holding recess 74 a. Thus, the coil connecting portion 74 includes a pair of arm portions 74b opposed to each other in the circumferential direction. The lower surface of the inner surface of the gripping recess 74a is formed in an arc shape with a lower recess as viewed in the radial direction.

As shown in fig. 7, the plurality of coil connecting portions 74 are arranged at intervals in the circumferential direction. The radial positions of the plurality of coil connecting portions 74 are the same as each other. In other words, the plurality of coil connection portions 74 are arranged on a concentric circle having the center axis J as the center as viewed in the axial direction. In the present embodiment, the radial positions of the plurality of coil connecting portions 74 are positions closer to the outer wall portion 63 than the inner wall portion 62. The radial distance between the coil connecting portion 74 and the outer side wall portion 63 is smaller than the radial distance between the coil connecting portion 74 and the inner side wall portion 62.

The circumferential positions of the plurality of coil connecting portions 74 are the same as the circumferential positions of the plurality of second groove portions 66b, respectively. That is, the coil connecting portion 74 is located radially inward of the second groove portion 66b as viewed in the axial direction.

As shown in fig. 1, the plurality of coils 40 are attached to the plurality of T-shaped brackets 22 through the insulators 30, respectively. More specifically, the coils 40 are attached to the plurality of T-shaped brackets 22 through the insulator main bodies 31, respectively. As shown in fig. 4, for example, 15 coils 40 are provided. Each of the plurality of coils 40 is formed of a conductive wire as a conductive member. More specifically, the plurality of coils 40 are each configured by winding a lead wire around each insulator body 31. In the present embodiment, each coil 40 is formed of one conductive wire. The conductive member constituting the coil 40 may be a plate-like member (e.g., a metal plate) instead of a linear conductive wire. The coil 40 may be formed by combining a plurality of plate-like members (e.g., metal plates). The coil 40 may be formed by winding a wire after the insulator 30 is mounted on the T-shaped frame 22. The coil 40 may be formed in advance by a conductive member such as a wire, and the coil 40 may be mounted on the T-shaped frame 22.

A pair of

coil lead wires

41a, 41b are respectively led out from the plurality of coils 40 to the upper side. The pair of

coil lead wires

41a and 41b are both ends of a wire constituting the coil 40. The coil lead wire 41a is an end portion on the winding start side of the wire constituting the coil 40. The coil lead wire 41b is an end portion on the side where the winding of the wire constituting the coil 40 is completed. In the present embodiment, both the

coil lead wires

41a and 41b are drawn upward from the radially outer end of the coil 40. In the following description, the coil lead wire 41a and the coil lead wire 41b will be simply referred to as the coil lead wire 41 unless they are distinguished from each other. In the present embodiment, the coil lead wire 41 corresponds to a coil lead portion.

The coil lead wire 41 drawn out upward from the coil 40 is bent radially outward, and a part thereof is positioned inside the through portion 33 a. As shown in fig. 5, the coil lead wire 41 is bent upward in the through portion 33a and passes through the first groove 66 a. Thus, in the present embodiment, the coil lead wires 41 are respectively led out to the upper side through the radial outside of the bus bar holder 60.

As shown in fig. 2, some of the coil lead wires 41 among the plurality of coils 40 are the second

coil lead wires

41U, 41V, 41W, and the other coil lead wires 41 are the first coil lead wires 41T. In the present embodiment, the first coil lead wire 41T corresponds to a first coil lead-out portion, and the second

coil lead wires

41U, 41V, 41W correspond to a second coil lead-out portion.

In the present embodiment, the second

coil lead wires

41U, 41V, and 41W are coil lead wires 41b that are the end portions of the wires constituting the coil 40 on the winding end side. The second

coil lead wires

41U, 41V, and 41W are linearly led out upward through the first groove portion 66 a. The second

coil lead wires

41U, 41V, and 41W are provided with insulating tubes 42. The insulating tube 42 is a member having insulating properties such as resin and insulating paper. As shown in fig. 1, the second

coil lead wires

41U, 41V, and 41W extend to the upper side of the bearing holder 4 through the holder through-hole 4a, and are connected to the control device 6. That is, the second

coil lead wires

41U, 41V, 41W are led upward and directly connected to the coil lead wires 41 of the control device 6. Thereby, the stator 10 is electrically connected to the control device 6. As described above, according to the present embodiment, the second

coil lead wires

41U, 41V, and 41W drawn upward from the coil 40 can be directly connected to the control device 6, and therefore, the connection between the stator 10 and the control device 6 is facilitated. The second

coil lead wires

41U, 41V, and 41W are connected to a power supply, not shown, of the control device 6. Thereby, electric power is supplied from the power supply to the coil 40 through the second

coil lead wires

41U, 41V, 41W. The phases of the currents flowing from the power supply to the second

coil lead wires

41U, 41V, 41W are different from each other.

As shown in fig. 5 and 6, the tip end portion of the first coil lead wire 41T is bent radially inward and is housed in the recessed portion 60 a. The distal end portions of the at least one first coil lead wire 41T are housed in the concave portions 60a, respectively. In the present embodiment, the tip end portion of each first coil lead wire 41T is housed in the recess 60 a. The tip end portion of the first coil lead wire 41T is connected to the coil connection portion 74 in the recess portion 60 a. Thereby, the coil connection portion 74 is connected to the coil 40, and the bus bar 70 is electrically connected to the coil 40. In the present embodiment, the tip end portion of the first coil lead wire 41T is bent radially inward by the inside of the second groove portion 66b, and is accommodated in the concave portion 60 a. The tip end portion of the first coil lead wire 41T is gripped between the pair of arm portions 74b in the circumferential direction. Therefore, the first coil lead wire 41T can be suppressed from moving in the circumferential direction, and the first coil lead wire 41T can be stably connected to the coil connection portion 74.

The front end portion of the first coil lead wire 41T has a first portion 41Ta, a second portion 41Tb, and a third portion 41 Tc. The first portion 41Ta is a portion located inside the second groove portion 66 b. The second portion 41Tb is a portion extending obliquely inward and downward in the radial direction from the radially inner end of the first portion 41 Ta. The third portion 41Tc is a portion linearly extending from the radially inner end of the second portion 41Tb to the radially outer side. In the present embodiment, the radially outer end of the third portion 41Tc is gripped by a pair of arm portions 74b and connected to the coil connecting portion 74. The third portion 41Tc is located lower than the first portion 41 Ta.

In the present embodiment, the tip end portion of the first coil lead wire 41T is fixed to the coil connecting portion 74 by welding, although not shown. Therefore, the first coil lead wire 41T and the coil connecting portion 74 can be more firmly connected, and the coil 40 and the bus bar 70 can be more accurately electrically connected. In the present embodiment, the third portion 41Tc is fixed to the coil connecting portion 74 by welding. The method of welding the leading end portion of the first coil lead wire 41T and the coil connection portion 74 is not particularly limited. The tip end portion of the first coil lead wire 41T and the coil connecting portion 74 are welded by, for example, resistance welding using electrodes sandwiching the pair of arm portions 74b from both sides in the circumferential direction.

In the present embodiment, the coil lead wire 41a, which is the end of the lead wire of the first coil lead wire 41T on the winding start side, is connected to the coil connecting portion 74 connected to the

radially extending portions

72U, 72V, 72W, 72N. The coil lead wire 41b, which is the end of the first coil lead wire 41T on the winding end side of the wire, is connected to the coil connecting portion 74 connected to the

radially extending portions

73U, 73V, 73W. The plurality of coils 40 are electrically connected to each other by connecting the first coil lead wire 41T to each coil connection portion 74. Specifically, 5 coils 40 are connected in series by three phase bus bars 70U. The 5 coils 40 different from the coil 40 connected to the phase bus 70U are connected in series by the three phase buses 70V. The remaining 5 coils 40 are connected in series by three phase bus bars 70W. The coil 40 groups connected in series by the

phase buses

70U, 70V, and 70W are connected by a neutral bus 70N. In this manner, the plurality of coils 40 of the present embodiment are connected by star connection.

According to the present embodiment, a pair of

coil lead wires

41a, 41b, which are both end portions of a lead wire constituting the coil 40, are respectively led out from the coil 40. Each of the

coil lead wires

41a and 41b is one of the second

coil lead wires

41U, 41V, and 41W connected to the power supply and the first coil lead wire 41T connected to the coil connection portion 74. Therefore, the coils 40 are connected to each other only by the bus bar 70, and no cross line is provided to connect the coils 40 to each other. This can reduce the step of mounting the insulating tube on the cross wire and the step of winding the cross wire in the circumferential direction.

The tip end portion of the first coil lead wire 41T is bent radially inward, and is accommodated in the concave portion 60a and connected to the coil connection portion 74. Therefore, the first coil lead wire 41T does not need to be wound in the circumferential direction, and can be easily connected to the coil connection portion 74. This allows the first coil leads 41T to be insulated from each other without providing an insulating tube on the first coil leads 41T, and thus prevents the first coil leads 41T from being short-circuited. Further, since the tip end portion of the first coil lead 41T is housed in the concave portion 60a of the bus bar holder 60, the first coil lead 41T and the coil 40 can be insulated from each other, and a short circuit between the first coil lead 41T and the coil 40 can be suppressed. Further, since it is not necessary to wind the coil lead wire 41 in the circumferential direction, the work of housing the coil lead wire 41 in the recess 60a can be easily automated. As described above, according to the present embodiment, the number of steps and time required for assembling the stator 10 can be reduced, and the productivity of the stator 10 can be improved.

According to the present embodiment, the plurality of recesses 60a are provided in the circumferential direction. Therefore, the first coil lead wires 41T accommodated in the different recesses 60a are shielded from each other by the side wall portion 65, and contact with each other is suppressed. Further, by providing the side wall portion 65, the creepage distance between the first coil leads 41T is increased, and the first coil leads 41T housed in the different concave portions 60a can be insulated from each other appropriately.

In addition, according to the present embodiment, each of the coil connection portions 74 is positioned inside the concave portion 60a, and accommodates the tip end portion of each of the first coil lead wires 41T. Therefore, all the first coil lead wires 41T can be appropriately insulated from each other.

According to the present embodiment, the radial positions of the plurality of coil connecting portions 74 are the same as each other. Therefore, the connection operation between each coil connection portion 74 and each first coil lead wire 41T can be performed at the same radial position. This makes it possible to more easily connect the coil connection portion 74 and the first coil lead wire 41T.

According to the present embodiment, the coil lead wire 41 passes through the first groove portion 66 a. Therefore, the coil lead wire 41 drawn upward through the radially outer side of the bus bar holder 60 can be held in the first groove portion 66 a. This can position the coil lead wires 41 in the circumferential direction, and can suppress the coil lead wires 41 from moving in the circumferential direction. Therefore, the connection operation of the coil lead wires 41 can be easily performed.

According to the present embodiment, the plurality of first groove portions 66a includes the first groove portions 66a located radially outward of the recessed portion 60 a. Therefore, by passing the first coil lead wire 41T through the first groove portion 66a, the circumferential position of the first coil lead wire 41T can be matched with the circumferential position of the concave portion 60 a. This makes it possible to easily guide the tip end portion of the first coil lead wire 41T to the recess 60 a.

According to the present embodiment, the coil connecting portion 74 is located radially inward of the second groove portion 66b as viewed in the axial direction. The tip end portion of the first coil lead wire 41T is bent inside the second groove portion 66b, and is housed inside the concave portion 60 a. Therefore, the tip end portion of the first coil lead wire 41T can be guided to the coil connection portion 74 through the inside of the second groove portion 66 b. This makes it possible to easily guide the distal end portion of the first coil lead wire 41T to the coil connection portion 74, and to more easily perform the connection operation between the first coil lead wire 41T and the coil connection portion 74.

As shown in fig. 2, the plurality of resin portions 80 are resin portions located in the plurality of recesses 60a, respectively. In the present embodiment, the resin portion 80 is produced by curing the adhesive flowing into the recess 60 a. As shown in fig. 5, in the present embodiment, the resin portion 80 is filled in a portion reaching the same height as the groove bottom surface of the second groove portion 66b in the recess 60 a.

The coil connecting portion 74, a part of the second portion 41Tb, and the third portion 41Tc are embedded in the resin portion 80. That is, the resin portion 80 covers the coil connection portion 74 and a part of the distal end portion of the first coil lead wire 41T. Therefore, the resin portion 80 can prevent liquid or the like from coming into contact with the coil connecting portion 74 from the outside. Therefore, for example, even when the motor 1 is immersed in a liquid, the resin portion 80 can insulate the coil connection portion 74. As a case where the liquid enters the motor 1, for example, a case where the motor 1 is mounted on a compressor is mentioned. In this case, a liquid such as a refrigerant or a refrigerator oil may enter the motor 1. As described above, the effect of insulating the coil connecting portion 74 by the resin portion 80 is particularly effective when the motor 1 is mounted on a compressor, for example. In fig. 6 and 9, the resin portion 80 is not shown. The resin portion 80 may be filled up to a portion not higher than the height of the groove bottom surface of the second groove portion 66b in the recess 60 a. Even in this case, the coil connecting portion 74 is preferably covered with the resin portion 80.

The resin portion 80 may not fill the entire inside of the recess 60a, and may cover only the coil connecting portion 74 and its periphery.

An operator or the like who assembles the stator 10 of the present embodiment connects a plurality of assemblies, each of which is formed by attaching the insulator 30 and the coil 40 to the stator core segment 20a, in the circumferential direction, and assembles the stator core 20. At this time, the coil lead wire 41 is linearly led out upward from the coil 40. An operator or the like fits the core cover 23 into the assembled stator core 20. Next, the operator or the like bends all the coil lead wires 41 radially outward. In this state, the worker or the like places the bus bar holder 60 holding the bus bar 70 on the upper side of the insulator 30.

Here, according to the present embodiment, the through portion 33a is provided in the insulator wall portion 33 of the insulator 30. Therefore, by bending the first coil lead 41T radially outward through the through portion 33a, the first coil lead 41T can be drawn radially outward from the insulator wall portion 33, and the bus bar holder 60 can be brought into contact with the upper end portions of the

insulator wall portions

32 and 33. This allows the bus bar holder 60 to be stably supported by the insulator 30, and allows the first coil lead wire 41T to be easily bent.

Next, the operator or the like bends all the coil lead wires 41 upward and inserts them into the first groove portions 66a from the radial outside. Then, the worker or the like attaches the insulating tube 42 to the second

coil lead wires

41U, 41V, and 41W among the coil lead wires 41. Further, the worker or the like bends the first coil lead wire 41T of the coil lead wires 41 radially inward through the inside of the second groove portion 66b and inserts the bent portion into the concave portion 60 a. The worker or the like fits the distal end portion of the first coil lead wire 41T inserted into the recess 60a between the pair of arm portions 74 b. The worker or the like fixes the distal end portion of the first coil lead wire 41T and the coil connection portion 74 by welding.

Here, according to the present embodiment, since each coil lead wire 41 is drawn upward through the radially outer side of the bus bar holder 60, it is possible to adopt a method of bending the coil lead wire 41 radially outward and then drawing upward as described above. This makes it possible to perform the bending operation of the coil lead wire 41 on the radially outer side of the bus bar holder 60, and thus, the work space can be easily secured. Therefore, the work of drawing out the coil lead wires 41 can be easily performed as compared with the case where the coil lead wires 41 are drawn out upward through the radially inner side of the bus bar holder 60.

Next, the operator or the like flows the uncured adhesive into the plurality of recesses 60a by a dispenser or the like to produce the resin portion 80. Here, for example, when the plurality of recesses 60a are one recess connected in the circumferential direction, the volume of the recess is relatively large, and the amount of adhesive flowing into the recess is likely to be relatively large. Therefore, the material cost of the resin portion 80 may increase, and the manufacturing cost of the stator 10 may increase.

In contrast, according to the present embodiment, the side wall portion 65 circumferentially partitions the space between the inner side wall portion 62 and the outer side wall portion 63 in the radial direction, and a plurality of concave portions 60a are provided in the circumferential direction. Therefore, the total volume in the recess 60a can be reduced by the side wall portion 65, as compared with the case where the plurality of recesses 60a are connected in the circumferential direction without providing the side wall portion 65. This can reduce the amount of adhesive flowing into the recess 60a, and can reduce the material cost of the resin portion 80. Therefore, the manufacturing cost of the stator 10 can be reduced. In addition, since the amount of the adhesive flowing into each concave portion 60a is reduced, the time for curing the flowing adhesive can be shortened. This can further shorten the time required for manufacturing the stator 10, and can further improve the productivity of the stator 10.

In the present embodiment, for example, a plurality of ejection ports for allowing the adhesive to flow into the recess 60 are provided in the circumferential direction, and the adhesive can be caused to flow into the plurality of recesses 60a at a time. The worker or the like rotates the dispenser or the bus bar holder 60 around the central axis J to sequentially flow the adhesive into the plurality of concave portions 60 a.

According to the present embodiment, the upper end of the coil connecting portion 74 is located below the groove bottom surface of the second groove portion 66 b. Therefore, the entire coil connecting portion 74 can be covered with the adhesive without the adhesive entering the upper side of the groove bottom surface of the second groove portion 66 b. This can prevent the adhesive from leaking from the second groove 66b, and cover the coil connecting portion 74 with the resin portion 80. Through the above, the stator 10 is assembled.

In the present specification, "operator" includes an operator who assembles the stator 10, an assembly device that assembles the stator 10, and the like. The stator 10 may be assembled by an operator alone, by an assembling device alone, or by an operator and an assembling device.

The present invention is not limited to the above-described embodiments, and other configurations may be adopted. The number of the recesses is not particularly limited as long as two or more recesses are formed. The two or more coil connection portions may be located inside the recess portion, and the tip portions of the two or more first coil lead-out portions (first coil lead-out wires) may be housed inside the recess portion. The number of coil connection portions located inside the one recess and the number of leading end portions of the first coil lead-out portion housed inside the one recess may be different for each recess. The shape of the recess is not particularly limited. The concave portion may be a circular arc extending in the circumferential direction. The first groove portion may not be provided. The second groove portion may not be provided. The resin portion may be made of a material other than an adhesive as long as it is made of resin. The resin portion may be provided only in a part of the recess. The resin portion may not be provided. The number of coil connecting portions included in the bus bar is not particularly limited, and may be 1, or 4 or more. That is, in the present specification, "the plurality of bus bars have a plurality of coil connecting portions" may be any as long as the total number of coil connecting portions included in the plurality of bus bars is two or more.

In the above-described embodiment, all the coil lead wires 41 are led out upward through the outside in the radial direction of the bus bar holder 60, but the present invention is not limited thereto. All of the coil lead-out portions (coil lead-out wires) may be led out upward through the radially inner side of the bus bar holder, or a part of the coil lead-out portions may be led out upward through the radially outer side of the bus bar holder, and another part of the coil lead-out portions may be led out upward through the radially inner side of the bus bar holder. One of the pair of coil lead-out portions extending from one coil may be led out upward through a radially inner side of the bus bar holder, and the other may be led out upward through a radially outer side of the bus bar holder. When the coil drawing portion is drawn upward through the radially inner side of the busbar holder, the first groove portion may be provided on the radially inner surface of the busbar holder, and the second groove portion may be provided at the upper end of the inner wall portion.

In the above-described embodiment, the pair of

coil lead wires

41a and 41b extending from the coil 40 are each configured to extend upward from a radially outer portion of the coil 40, but the present invention is not limited thereto. The pair of coil lead-out portions (coil lead-out wires) extending from the coil may both extend upward from a portion on the radially inner side of the coil, or one may extend upward from a portion on the radially outer side of the coil and the other may extend upward from a portion on the radially inner side of the coil. The coil drawing portion may not be linear. For example, when the coil is formed of a plate-like member, the coil drawing portion may be plate-like.

The first coil lead-out portion and the coil connecting portion may be connected in any manner as long as they are connected to each other. The first coil lead-out portion and the coil connecting portion may not be welded. The first coil lead-out portion and the coil connecting portion may be fixed by a conductive adhesive or may be connected by another conductive member. The connection may also be by solder. In the case of connection by another conductive member, the first coil lead-out portion and the coil connection portion may be connected by, for example, caulking the metal plate with the conductive member as the metal plate. The plurality of coil connecting portions may be different in radial position from each other. The shape of the coil connecting portion is not particularly limited.

The second coil lead-out portion (second coil lead-out wire) may not be provided. In this case, all the coil lead-out portions are first coil lead-out portions (first coil lead-out wires) housed in the recessed portions. In this case, a part of the first coil lead-out portions is connected to the control device via, for example, a bus bar for connection of the control device held by the bus bar holder. In this case, the bus bar for connection to the control device has a terminal portion extending to the control device through the holder through hole.

The shape of the coil connection part may be the shape of the coil connection part 174 as shown in fig. 9. As shown in fig. 9, the coil connecting portion 174 does not have the pair of arm portions 74b unlike the coil connecting portion 74 of the above-described embodiment. The coil connection portion 174 is located on the circumferential direction side of the third portion 141Tc in the first coil lead wire 141T. The coil connecting portion 174 is connected to a radially outer end of the third portion 141 Tc. According to this configuration, since the pair of arm portions 74b need not be provided in the coil connecting portion 174, the bus bar 170 can be easily manufactured. In the configuration of fig. 9, the first coil lead wire 141T corresponds to a first coil lead portion.

In the configuration of fig. 9, the bus bar holder 160 has a pair of protruding

portions

167a, 167b protruding upward from the base portion 61. The pair of

projections

167a, 167b are arranged apart from each other in the circumferential direction. The radially inner ends of the pair of

projections

167a and 167b are connected to the radially inner surface of the inner wall portion 62. The circumferential center between the pair of

projections

167a, 167b is located at the same position in the circumferential direction as the circumferential center of the second groove portion 67 b. The protruding portion 167b is located radially inward of the coil connecting portion 174. Although not shown, a pair of

projections

167a and 167b are provided to the coil connecting portion 174 located in the recess 60 a. As in the above-described embodiment, when the coil connection portions 174 are located in the recesses 60a, a pair of the protruding

portions

167a and 167b is provided for each of the recesses 60 a.

The radially inner end of the third portion 141Tc is gripped between the pair of

projections

167a, 167b in the circumferential direction. Thereby, the tip end portion of the first coil lead wire 141T is gripped between the pair of protrusions 167a, 167b in the circumferential direction. Therefore, even if the pair of arm portions 74b is not provided in the coil connecting portion 174, the first coil lead wire 141T can be suppressed from moving in the circumferential direction, and the first coil lead wire 141T and the coil connecting portion 174 can be easily connected.

Each coil may be formed by winding a plurality of bundled wires, for example. In this case, the coil lead wires are both ends of the bundled plurality of wires. The insulator may not be provided. The plurality of coils may constitute a plurality of coil groups different from each other in power system. In this case, power is supplied to each coil group independently. In this case, a recess for accommodating the tip end portion of the first coil drawing portion may be provided for each different power system.

The motor of the above embodiment is a three-phase motor. However, the number of phases of the motor is not limited to three, and may be a single-phase, two-phase, or four or more-phase multi-phase electrode. The number, shape, and the like of the phase bus bars and the like can be appropriately changed according to the number of phases.

The motor of the above embodiment is not particularly limited in application, and may be mounted in a device other than a compressor. The respective structures described in this specification can be combined as appropriate within a range not inconsistent with each other.

Description of the symbols

1-motor, 3-rotor, 3 a-shaft, 10-stator, 20-stator core, 21-core back, 22-T-frame, 30-insulator, 31-insulator body, 32, 33-insulator wall, 33 a-through portion, 40-coil, 41a, 41 b-coil lead-out wire (coil lead-out portion), 41T, 141T-first coil lead-out wire (first coil lead-out portion), 41U, 41V, 41W-second coil lead-out wire (second coil lead-out portion), 60, 160-bus bar holder, 60 a-recess, 61-base, 62-inner side wall, 63-outer side wall, 65a, 65 b-side wall, 66 a-first groove, 66 b-second groove, 70, 170-bus bar, 74N, 74U, 74V, 74W, 174-coil connection portion, 74 b-bus bar, 80-resin portion, 167a, 167 b-protrusion portion, j-center axis.

Claims

1. A stator of a motor including a shaft rotating around a central axis, the stator being characterized in that,

the disclosed device is provided with:

a stator core having a core rear portion extending in a circumferential direction and a plurality of T-shaped frames extending in a radial direction from the core rear portion;

a plurality of coils each of which is composed of a conductive member and is mounted on the plurality of T-shaped frames;

a bus bar support which is annular along the circumferential direction and is positioned at one axial side of the stator core; and

a plurality of bus bars held by the bus bar holder and electrically connected to the coil,

the bus bar support includes:

a ring-shaped base portion in a circumferential direction;

an annular inner wall portion projecting from a radially inner edge portion of the base portion to one axial side;

an annular outer wall portion projecting from a radially outer edge portion of the base portion to one axial side; and

a plurality of side wall portions that protrude from the base portion toward one axial side and extend in a radial direction, and that connect the inner side wall portion and the outer side wall portion,

the plurality of side wall parts are arranged at intervals along the circumferential direction,

the base portion, the inner wall portion, the outer wall portion, and the side wall portion form a plurality of recesses in a circumferential direction, the recesses being recessed toward the other axial side,

the plurality of bus bars have a plurality of coil connecting portions connected to the coils,

the plurality of coil connecting portions are arranged at intervals in a circumferential direction, protrude from the base portion to one side in an axial direction, and are positioned inside the recess,

a pair of coil lead-out portions which are both end portions of the conductive member and are respectively led out from the plurality of coils to one side in the axial direction through one side in the radial direction of the bus bar holder,

at least a part of the coil lead-out portions of the plurality of coils are first coil lead-out portions having distal end portions bent toward the other side in the radial direction and accommodated in the concave portions,

at least one of the coil connecting portions is positioned inside the recess, and a tip portion of at least one of the coil drawing portions is received inside the recess,

the leading end of the first coil lead-out portion is connected to the coil connecting portion in the recess.

2. The stator according to claim 1,

each of the coil connecting portions is positioned inside the recess, and a tip end portion of each of the first coil drawing portions is housed inside the recess.

3. The stator according to claim 1 or 2,

the radial positions of the plurality of coil connecting portions are the same.

4. A stator according to any one of claims 1 to 3,

a first groove part extending in the axial direction is arranged on the surface of one side of the bus bar support in the radial direction,

the first groove portion is opened to both sides in the axial direction,

the coil lead-out portion passes through the first groove portion.

5. The stator according to claim 4,

a plurality of first groove parts are arranged along the circumferential direction,

the plurality of first grooves include a first groove located on one side in the radial direction of the recess.

6. The stator according to claim 4 or 5,

a second groove portion recessed toward the other axial side is provided at one axial end portion of the wall portion on the one radial side of the inner wall portion and the outer wall portion,

the second groove portion is opened to both sides in the radial direction,

the end portion of the second groove portion on one side in the radial direction is connected to the end portion of the first groove portion on one side in the axial direction,

the end portion of the other side in the radial direction of the second groove portion is connected to the recessed portion,

the coil connecting portion is located on the other side in the radial direction of the second groove portion as viewed in the axial direction,

the tip end portion of the first coil drawing portion passes through the inside of the second groove portion, is bent, and is accommodated in the recess.

7. The stator according to claim 6,

an end portion of the coil connecting portion on one axial side is located on the other axial side than a surface on the other axial side among inner surfaces of the second groove portions.

8. The stator according to any one of claims 1 to 7,

the coil connecting portion is provided with a plurality of recessed portions, and the plurality of recessed portions are formed in the coil connecting portion.

9. The stator according to any one of claims 1 to 8,

the coil lead-out portions are led out to one axial side through the radial outer sides of the bus bar holders.

10. The stator according to any one of claims 1 to 9,

further comprises an insulator mounted on the T-shaped frame,

the coil is mounted on the T-shaped frame through the insulator,

the bus bar support is positioned on one axial side of the insulator,

the insulator includes:

a cylindrical insulator body through which the T-shaped frame passes; and

a pair of insulator wall parts protruding from the end parts of the insulator main body at two sides in the radial direction to one side in the axial direction,

the pair of insulator wall portions support the bus bar holder from the other axial side,

the insulator wall portion located on one side in the radial direction among the pair of insulator wall portions has a penetrating portion penetrating the insulator wall portion in the radial direction,

the through part is opened to one side in the axial direction,

a part of the coil lead-out portion is located inside the through portion.

11. The stator according to any one of claims 1 to 10,

the coil connecting portion has a pair of arm portions opposed to each other in a circumferential direction,

the tip end portion of the first coil drawing portion is held between the pair of arm portions in the circumferential direction.

12. The stator according to any one of claims 1 to 10,

the coil connecting part is a plate with a plate surface facing to the circumferential direction,

the bus bar holder has a pair of protrusions protruding from the base portion to one axial side,

the pair of protrusions are arranged apart from each other in the circumferential direction,

the tip end of the first coil drawing portion is held between the pair of protrusions in the circumferential direction.

13. The stator according to any one of claims 1 to 12,

the front end of the first coil lead-out portion is fixed to the coil connecting portion by welding.

14. A motor is characterized in that a motor is provided,

the disclosed device is provided with:

a stator according to any one of claims 1 to 13; and

and a rotor facing the stator with a gap in a radial direction.

15. The electric machine of claim 14,

further comprises a control device electrically connected to the stator,

the coil drawing portion of a part of the coil drawing portions of the plurality of coils is a second coil drawing portion which is drawn to one side in the axial direction and is directly connected to the control device.